A British drama series - late 90s / early 2000s - about a gangland family.
I think it was set in the 60s.
As I recall, when the boss dies, the son and daughter take over the family and disown their domineering mother.
One scene which sticks in my mind is of a guy with learning disabilities getting his arm cut off with cheese wire by a rival gang as a warning to the family.
There is also a scene of one gang member getting both his kneecaps shot.